SOLUTION: Suppose that the credit remaining on a phone card (in dollars) is a linear function of the total calling time (in minutes). When graphed, the function gives a line with a slope of
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Question 223142: Suppose that the credit remaining on a phone card (in dollars) is a linear function of the total calling time (in minutes). When graphed, the function gives a line with a slope of -0.16
There is $29.00 in credit remaining on the card after 25 minutes of calls. How much credit was there after 18 minutes of calls?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Suppose that the credit remaining on a phone card (in dollars) is a linear function of the total calling time (in minutes). When graphed, the function gives a line with a slope of -0.16
There is $29.00 in credit remaining on the card after 25 minutes of calls. How much credit was there after 18 minutes of calls?
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Credit Equation: C(x) = -0.16x + r where "x" is number of minutes of calls
29 = -0.16*25 + r
r = 29+4 dollars
r = 33 dollars
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So the Credit Remaining equation is:
C(x) = -0.16x + 33
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How much credit was there after 18 minutes of calls?
C(18) = -0.16*18+33
C(18) = $30.12
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Cheers,
Stan H.
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